Lagrangian Mixing in an Axisymmetric Hurricane Model

Abstract

This paper discusses the extension of established Lagrangian mixing measures to make them applicable to data extracted from a 2-D axisymmetric hurricane simulation. Because of the non-steady and unbounded characteristics of the simulation, the previous measures are extended to a moving frame approach to create time-dependent mixing rates that are dependent upon the initial time of particle integration and are computed for nonlocal regions. The global measures of mixing derived from finite-time Lyapunov exponents, relative dispersion, and a measured mixing rate are applied to distinct regions representing different characteristic features within the model. It is shown that these time-dependent mixing rates exhibit correlations with maximal tangential winds during a quasi-steady state, establishing a connection between mixing and hurricane intensity.

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Document Details

Document Type
Technical Report
Publication Date
Jul 23, 2010
Accession Number
ADA554484

Entities

People

  • B. Rutherford
  • G. Dangelmayr
  • John Persing
  • M. Kirby
  • Michael T. Montgomery

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Axisymmetric
  • Boundary Layer
  • Buoyancy
  • Computational Science
  • Correlation Analysis
  • Cyclones
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Hurricanes
  • Mixing
  • Simulations
  • Steady State
  • Stratified Fluids
  • Three Dimensional
  • Tropical Cyclones
  • Two Dimensional

Readers

  • Calculus or Mathematical Analysis
  • Combustion and Flow Dynamics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)